[GHC] #7668: Location in -fdefer-type-errors

[GHC]

#7668: Location in -fdefer-type-errors
---------------------------------+------------------------------------------
    Reporter:  monoidal          |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Milestone:                  
   Component:  Compiler          |     Version:  7.6.2           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Changes (by simonpj):

  * difficulty:  => Unknown


Comment:

 Yes, that's a good point.  It happens becuase the constraint solver
 "commons up" equal constraints.  I suppose it could not do that when you
 have `-fdefer-type-errors`, but that would make the parts of the code that
 are perfectly ok have less sharing.

 I don't see an easy way to fix this.  I'll just leave it open and see how
 pressing it seems in practice.

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7668#comment:2>
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